TV star Nathan Fillion is known for his work on Castle, but after his appearance on Conan last night, he might be better known as a nail artist. Check out the super job he did on his girlfriend’s toenails. The actor explained to host Conan O’Brien that his girlfriend was perusing nail art when he made the claim that he could do that himself. And it turns out, he can. The actor described the process as a difficult one, but managed to stay organized by doing DC Comics art on one foot and Marvel on the other. Click on the video to marvel at his work.